Motorola DSP56301 - Manual (Page 116)

General-Purpose Input/Output (GPIO)
5 -6 DSP56301 User’s Manual
5.4.2 Port C Signals and Registers
Each of the six Port C signals not used as an ESSI0 signal can be configured as a GPIO signal.
Three registers control the GPIO functionality of Port C: Port C control register (PCRC), Port
C direction register (PRRC), and Port C data register (PDRC). Chapter 7, Enhanced
Synchronous Serial Interface (ESSI) discusses these registers.
5.4.3 Port D Signals and Registers
Each of the six Port D signals not used as an ESSI1 signal can be configured as a GPIO signal.
Three registers control the GPIO functionality of Port D: Port D control register (PCRD), Port
D direction register (PRRD), and Port D data register (PDRD). Chapter 7, Enhanced
Synchronous Serial Interface (ESSI) discusses these registers.
5.4.4 Port E Signals and Registers
Each of the three Port E signals not used as an SCI signal can be configured as a GPIO signal.
Three registers control the GPIO functionality of Port E: Port E control register (PCRE), Port
E direction register (PRRE), and Port E data register (PDRE). Chapter 8, Serial
Communication Interface (SCI) discusses these registers.
Figure 5-3. Port C Signals
Figure 5-4. Port D Signals
Figure 5-5. Port E Signals
DSP56301
Enhanced Synchronous
Serial Interface Port 0
(ESSI0)
SC0[0–2]
SCK0
SRD0
STD0
Port C GPIO
PC[0–2]
PC3
PC4
PC5
DSP56301
Enhanced Synchronous
Serial Interface Port 1
(ESSI1)
SC1[0–2]
SCK1
SRD1
STD1
Port D GPIO
PD[0–2]
PD3
PD4
PD5
DSP56301
Serial
Communications
Interface (SCI) Port
RXD
TXD
SCLK
Port E GPIO
PE0
PE1
PE2